<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../reactBag/react.development.js"></script>
    <script src="../reactBag/react-dom.development.js"></script>
    <script src="../reactBag/babel.min.js"></script>
</head>
<body>
    <div id="app"></div>


    <script type="text/babel">
        class App extends React.Component{
            constructor(){
                super()
            }

            state = {
                text : 0
            }
            render(){
                const {text} = this.state;
                return  <div>
                            <button onClick = {this.fn}> 点击加一</button>
                            <p>{text}</p>
                        </div>
            }
            fn = ()=>{
                alert(1)
                console.log(this);
            }
        }

        ReactDOM.createRoot(document.getElementById('app')).render(<App/>)

    </script>
</body>
</html>